Server JSON Output Does Not Report Client's Results #1908
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Contributor
|
Thanks for the PR! Admittedly we want to be a little careful with the order of operations, just something we would need to test for this (and any other similar) code change. |
Contributor
Author
|
@bmah888, I agree, and after further testing, these changes will need more thought from my end. I've moved this PR into a draft state and will add some updates to the template with more meaningful findings and a description of the new changes. |
Contributor
Author
|
PR back in the |
davidBar-On
reviewed
Oct 6, 2025
| FD_CLR(sp->socket, &test->write_set); | ||
| close(sp->socket); | ||
| } | ||
| test->reporter_callback(test); |
Contributor
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I believe that the right change is to move this call to reporter_callback after setting the state to DISPLAY_RESULTS, i.e. move this line after original line 284 below. With this change, all other changes in this PR should probably be undone.
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Author
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That was the change I made in my first attempt, but then I saw that it broke the --get-server-output flag on the client side. My understanding is that at the test's end, the call to reporter_callback populates the (potentially) last interval in the JSON and then populates the end field, so moving the call to after setting the state to DISPLAY_RESULTS would give the client a JSON result with a (potentially) missing interval and missing end. In this snippet, the last interval on the server side was discarded instead of added to the JSON so both the client and server have 4 intervals, but I have seen cases where the server has one more wualified interval that this change never appends. The end is always missing:
Client JSON w/Server Json (First Attempt)
{
"start": {
"connected": [{
"socket": 5,
"local_host": "127.0.0.1",
"local_port": 64953,
"remote_host": "127.0.0.1",
"remote_port": 5201
}],
"version": "iperf 3.19.1+",
"system_info": "Darwin CASML-K204175 24.6.0 Darwin Kernel Version 24.6.0: Mon Aug 11 21:16:31 PDT 2025; root:xnu-11417.140.69.701.11~1/RELEASE_ARM64_T6030 arm64",
"timestamp": {
"time": "Wed, 22 Oct 2025 01:05:27 UTC",
"timesecs": 1761095127,
"timemillisecs": 1761095127061
},
"connecting_to": {
"host": "127.0.0.1",
"port": 5201
},
"cookie": "44tsufxw2whdis7ollqo5w62gm5hyjtpagwq",
"tcp_mss_default": 16332,
"target_bitrate": 170000000,
"fq_rate": 0,
"sock_bufsize": 0,
"sndbuf_actual": 131072,
"rcvbuf_actual": 131072,
"test_start": {
"protocol": "TCP",
"num_streams": 1,
"blksize": 131072,
"omit": 0,
"duration": 4,
"bytes": 0,
"blocks": 0,
"reverse": 1,
"tos": 0,
"target_bitrate": 170000000,
"bidir": 0,
"fqrate": 0,
"interval": 1
}
},
"intervals": [{
"streams": [{
"socket": 5,
"start": 0,
"end": 1.005023,
"seconds": 1.0050230026245117,
"bytes": 21364736,
"bits_per_second": 170063657.80053386,
"omitted": false,
"sender": false
}],
"sum": {
"start": 0,
"end": 1.005023,
"seconds": 1.0050230026245117,
"bytes": 21364736,
"bits_per_second": 170063657.80053386,
"omitted": false,
"sender": false
}
}, {
"streams": [{
"socket": 5,
"start": 1.005023,
"end": 2.005025,
"seconds": 1.0000020265579224,
"bytes": 21233664,
"bits_per_second": 169868967.75069764,
"omitted": false,
"sender": false
}],
"sum": {
"start": 1.005023,
"end": 2.005025,
"seconds": 1.0000020265579224,
"bytes": 21233664,
"bits_per_second": 169868967.75069764,
"omitted": false,
"sender": false
}
}, {
"streams": [{
"socket": 5,
"start": 2.005025,
"end": 3.001299,
"seconds": 0.99627399444580078,
"bytes": 21233664,
"bits_per_second": 170504613.13555968,
"omitted": false,
"sender": false
}],
"sum": {
"start": 2.005025,
"end": 3.001299,
"seconds": 0.99627399444580078,
"bytes": 21233664,
"bits_per_second": 170504613.13555968,
"omitted": false,
"sender": false
}
}, {
"streams": [{
"socket": 5,
"start": 3.001299,
"end": 4.004282,
"seconds": 1.0029829740524292,
"bytes": 21233664,
"bits_per_second": 169364103.27451918,
"omitted": false,
"sender": false
}],
"sum": {
"start": 3.001299,
"end": 4.004282,
"seconds": 1.0029829740524292,
"bytes": 21233664,
"bits_per_second": 169364103.27451918,
"omitted": false,
"sender": false
}
}],
"end": {
"streams": [{
"sender": {
"socket": 5,
"start": 0,
"end": 4.0049,
"seconds": 4.0049,
"bytes": 85196800,
"bits_per_second": 170185123.22405052,
"sender": false
},
"receiver": {
"socket": 5,
"start": 0,
"end": 4.004282,
"seconds": 4.004282,
"bytes": 85065728,
"bits_per_second": 169949525.03345171,
"sender": false
}
}],
"sum_sent": {
"start": 0,
"end": 4.0049,
"seconds": 4.0049,
"bytes": 85196800,
"bits_per_second": 170185123.22405052,
"sender": false
},
"sum_received": {
"start": 0,
"end": 4.004282,
"seconds": 4.004282,
"bytes": 85065728,
"bits_per_second": 169949525.03345171,
"sender": false
},
"cpu_utilization_percent": {
"host_total": 5.1971978267434347,
"host_user": 0.068432125663544535,
"host_system": 5.1289154431491752,
"remote_total": 9.33060535336937,
"remote_user": 0.11053911978700184,
"remote_system": 9.22014114150181
}
},
"server_output_json": {
"start": {
"connected": [{
"socket": 5,
"local_host": "127.0.0.1",
"local_port": 5201,
"remote_host": "127.0.0.1",
"remote_port": 64953
}],
"version": "iperf 3.19.1+",
"system_info": "Darwin CASML-K204175 24.6.0 Darwin Kernel Version 24.6.0: Mon Aug 11 21:16:31 PDT 2025; root:xnu-11417.140.69.701.11~1/RELEASE_ARM64_T6030 arm64",
"target_bitrate": 170000000,
"sock_bufsize": 0,
"sndbuf_actual": 131072,
"rcvbuf_actual": 131072,
"timestamp": {
"time": "Wed, 22 Oct 2025 01:05:27 UTC",
"timesecs": 1761095127,
"timemillisecs": 1761095127061
},
"accepted_connection": {
"host": "127.0.0.1",
"port": 64952
},
"cookie": "44tsufxw2whdis7ollqo5w62gm5hyjtpagwq",
"tcp_mss_default": 0,
"target_bitrate": 170000000,
"fq_rate": 0,
"test_start": {
"protocol": "TCP",
"num_streams": 1,
"blksize": 131072,
"omit": 0,
"duration": 4,
"bytes": 0,
"blocks": 0,
"reverse": 1,
"tos": 0,
"target_bitrate": 170000000,
"bidir": 0,
"fqrate": 0,
"interval": 1
}
},
"intervals": [{
"streams": [{
"socket": 5,
"start": 0,
"end": 1.005005,
"seconds": 1.0050050020217896,
"bytes": 21364736,
"bits_per_second": 170066703.80362377,
"omitted": false,
"sender": true
}],
"sum": {
"start": 0,
"end": 1.005005,
"seconds": 1.0050050020217896,
"bytes": 21364736,
"bits_per_second": 170066703.80362377,
"omitted": false,
"sender": true
}
}, {
"streams": [{
"socket": 5,
"start": 1.005005,
"end": 2.002644,
"seconds": 0.997639000415802,
"bytes": 21233664,
"bits_per_second": 170271322.52167451,
"omitted": false,
"sender": true
}],
"sum": {
"start": 1.005005,
"end": 2.002644,
"seconds": 0.997639000415802,
"bytes": 21233664,
"bits_per_second": 170271322.52167451,
"omitted": false,
"sender": true
}
}, {
"streams": [{
"socket": 5,
"start": 2.002644,
"end": 3.005021,
"seconds": 1.0023770332336426,
"bytes": 21233664,
"bits_per_second": 169466484.53427345,
"omitted": false,
"sender": true
}],
"sum": {
"start": 2.002644,
"end": 3.005021,
"seconds": 1.0023770332336426,
"bytes": 21233664,
"bits_per_second": 169466484.53427345,
"omitted": false,
"sender": true
}
}, {
"streams": [{
"socket": 5,
"start": 3.005021,
"end": 4.00263,
"seconds": 0.99760901927948,
"bytes": 21233664,
"bits_per_second": 170276439.68444431,
"omitted": false,
"sender": true
}],
"sum": {
"start": 3.005021,
"end": 4.00263,
"seconds": 0.99760901927948,
"bytes": 21233664,
"bits_per_second": 170276439.68444431,
"omitted": false,
"sender": true
}
}],
"end": {
}
}
}My most recent change adjusts the order of operations, where the server first acquires the Client's results, takes what it needs from those results and inserts them into its results, and then sends its results back to the Client.
Client JSON w/Server Json (Final)
{
"start": {
"connected": [{
"socket": 5,
"local_host": "127.0.0.1",
"local_port": 60354,
"remote_host": "127.0.0.1",
"remote_port": 5201
}],
"version": "iperf 3.19.1+",
"system_info": "Darwin CASML-K204175 24.6.0 Darwin Kernel Version 24.6.0: Mon Aug 11 21:16:31 PDT 2025; root:xnu-11417.140.69.701.11~1/RELEASE_ARM64_T6030 arm64",
"timestamp": {
"time": "Wed, 22 Oct 2025 15:43:56 UTC",
"timesecs": 1761147836,
"timemillisecs": 1761147836394
},
"connecting_to": {
"host": "127.0.0.1",
"port": 5201
},
"cookie": "oavle55tz4jfn4u4i4gqvcmect33esyt72jx",
"tcp_mss_default": 16332,
"target_bitrate": 170000000,
"fq_rate": 0,
"sock_bufsize": 0,
"sndbuf_actual": 131072,
"rcvbuf_actual": 131072,
"test_start": {
"protocol": "TCP",
"num_streams": 1,
"blksize": 131072,
"omit": 0,
"duration": 4,
"bytes": 0,
"blocks": 0,
"reverse": 1,
"tos": 0,
"target_bitrate": 170000000,
"bidir": 0,
"fqrate": 0,
"interval": 1
}
},
"intervals": [{
"streams": [{
"socket": 5,
"start": 0,
"end": 1.000461,
"seconds": 1.0004609823226929,
"bytes": 21233664,
"bits_per_second": 169791041.33139461,
"omitted": false,
"sender": false
}],
"sum": {
"start": 0,
"end": 1.000461,
"seconds": 1.0004609823226929,
"bytes": 21233664,
"bits_per_second": 169791041.33139461,
"omitted": false,
"sender": false
}
}, {
"streams": [{
"socket": 5,
"start": 1.000461,
"end": 2.005027,
"seconds": 1.004565954208374,
"bytes": 21364736,
"bits_per_second": 170141031.83965462,
"omitted": false,
"sender": false
}],
"sum": {
"start": 1.000461,
"end": 2.005027,
"seconds": 1.004565954208374,
"bytes": 21364736,
"bits_per_second": 170141031.83965462,
"omitted": false,
"sender": false
}
}, {
"streams": [{
"socket": 5,
"start": 2.005027,
"end": 3.004404,
"seconds": 0.99937701225280762,
"bytes": 21233664,
"bits_per_second": 169975204.46971115,
"omitted": false,
"sender": false
}],
"sum": {
"start": 2.005027,
"end": 3.004404,
"seconds": 0.99937701225280762,
"bytes": 21233664,
"bits_per_second": 169975204.46971115,
"omitted": false,
"sender": false
}
}, {
"streams": [{
"socket": 5,
"start": 3.004404,
"end": 4.003841,
"seconds": 0.99943697452545166,
"bytes": 21233664,
"bits_per_second": 169965006.62851363,
"omitted": false,
"sender": false
}],
"sum": {
"start": 3.004404,
"end": 4.003841,
"seconds": 0.99943697452545166,
"bytes": 21233664,
"bits_per_second": 169965006.62851363,
"omitted": false,
"sender": false
}
}],
"end": {
"streams": [{
"sender": {
"socket": 5,
"start": 0,
"end": 4.004357,
"seconds": 4.004357,
"bytes": 85065728,
"bits_per_second": 169946341.94703421,
"sender": false
},
"receiver": {
"socket": 5,
"start": 0,
"end": 4.003841,
"seconds": 4.003841,
"bytes": 85065728,
"bits_per_second": 169968243.993705,
"sender": false
}
}],
"sum_sent": {
"start": 0,
"end": 4.004357,
"seconds": 4.004357,
"bytes": 85065728,
"bits_per_second": 169946341.94703421,
"sender": false
},
"sum_received": {
"start": 0,
"end": 4.003841,
"seconds": 4.003841,
"bytes": 85065728,
"bits_per_second": 169968243.993705,
"sender": false
},
"cpu_utilization_percent": {
"host_total": 5.85302413254988,
"host_user": 0.071980644596251531,
"host_system": 5.78116789280084,
"remote_total": 11.173274335841226,
"remote_user": 0.096386986258611779,
"remote_system": 11.076762495973473
}
},
"server_output_json": {
"start": {
"connected": [{
"socket": 5,
"local_host": "127.0.0.1",
"local_port": 5201,
"remote_host": "127.0.0.1",
"remote_port": 60354
}],
"version": "iperf 3.19.1+",
"system_info": "Darwin CASML-K204175 24.6.0 Darwin Kernel Version 24.6.0: Mon Aug 11 21:16:31 PDT 2025; root:xnu-11417.140.69.701.11~1/RELEASE_ARM64_T6030 arm64",
"target_bitrate": 170000000,
"sock_bufsize": 0,
"sndbuf_actual": 131072,
"rcvbuf_actual": 131072,
"timestamp": {
"time": "Wed, 22 Oct 2025 15:43:56 UTC",
"timesecs": 1761147836,
"timemillisecs": 1761147836394
},
"accepted_connection": {
"host": "127.0.0.1",
"port": 60353
},
"cookie": "oavle55tz4jfn4u4i4gqvcmect33esyt72jx",
"tcp_mss_default": 0,
"target_bitrate": 170000000,
"fq_rate": 0,
"test_start": {
"protocol": "TCP",
"num_streams": 1,
"blksize": 131072,
"omit": 0,
"duration": 4,
"bytes": 0,
"blocks": 0,
"reverse": 1,
"tos": 0,
"target_bitrate": 170000000,
"bidir": 0,
"fqrate": 0,
"interval": 1
}
},
"intervals": [{
"streams": [{
"socket": 5,
"start": 0,
"end": 1.002389,
"seconds": 1.0023889541625977,
"bytes": 21364736,
"bits_per_second": 170510546.12107724,
"omitted": false,
"sender": true
}],
"sum": {
"start": 0,
"end": 1.002389,
"seconds": 1.0023889541625977,
"bytes": 21364736,
"bits_per_second": 170510546.12107724,
"omitted": false,
"sender": true
}
}, {
"streams": [{
"socket": 5,
"start": 1.002389,
"end": 2.000762,
"seconds": 0.998372972011566,
"bytes": 21233664,
"bits_per_second": 170146144.53928953,
"omitted": false,
"sender": true
}],
"sum": {
"start": 1.002389,
"end": 2.000762,
"seconds": 0.998372972011566,
"bytes": 21233664,
"bits_per_second": 170146144.53928953,
"omitted": false,
"sender": true
}
}, {
"streams": [{
"socket": 5,
"start": 2.000762,
"end": 3.004524,
"seconds": 1.0037620067596436,
"bytes": 21233664,
"bits_per_second": 169232657.59816328,
"omitted": false,
"sender": true
}],
"sum": {
"start": 2.000762,
"end": 3.004524,
"seconds": 1.0037620067596436,
"bytes": 21233664,
"bits_per_second": 169232657.59816328,
"omitted": false,
"sender": true
}
}, {
"streams": [{
"socket": 5,
"start": 3.004524,
"end": 4.004357,
"seconds": 0.99983298778533936,
"bytes": 21233664,
"bits_per_second": 169897686.98896974,
"omitted": false,
"sender": true
}],
"sum": {
"start": 3.004524,
"end": 4.004357,
"seconds": 0.99983298778533936,
"bytes": 21233664,
"bits_per_second": 169897686.98896974,
"omitted": false,
"sender": true
}
}],
"end": {
"streams": [{
"sender": {
"socket": 5,
"start": 0,
"end": 4.004357,
"seconds": 4.004357,
"bytes": 85065728,
"bits_per_second": 169946341.94703421,
"sender": true
},
"receiver": {
"socket": 5,
"start": 0,
"end": 4.003841,
"seconds": 4.004357,
"bytes": 85065728,
"bits_per_second": 169968243.993705,
"sender": true
}
}],
"sum_sent": {
"start": 0,
"end": 4.004357,
"seconds": 4.004357,
"bytes": 85065728,
"bits_per_second": 169946341.94703421,
"sender": true
},
"sum_received": {
"start": 0,
"end": 4.003841,
"seconds": 4.003841,
"bytes": 85065728,
"bits_per_second": 169968243.993705,
"sender": true
},
"cpu_utilization_percent": {
"host_total": 11.173274335841226,
"host_user": 0.096386986258611779,
"host_system": 11.076762495973473,
"remote_total": 5.85302413254988,
"remote_user": 0.071980644596251531,
"remote_system": 5.78116789280084
}
}
}
}
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Ok. Thanks for the explanation.
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These changes will have to wait for #1956. Merging those changes will resolve the failing tests in the pipeline. |
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PLEASE NOTE the following text from the iperf3 license. Submitting a
pull request to the iperf3 repository constitutes "[making]
Enhancements available...publicly":
The complete iperf3 license is available in the
LICENSEfile in thetop directory of the iperf3 source tree.
Version of iperf3 (or development branch, such as
masteror3.1-STABLE) to which this pull request applies:masterIssues fixed (if any): iperf/#1410
Brief description of code changes (suitable for use as a commit message):
On the
iperfserver, no results are displayed from the client's side, even though this information is sent to the server. It appears that the reporter callback was called prior to setting the test state toDISPLAY_RESULTS. Moving the call to the reporter callback function to after that state is set seems to fix the issue, as I can now see the client's results displayed in the server's JSON output.Server JSON
{ "start": { "connected": [{ "socket": 5, "local_host": "127.0.0.1", "local_port": 5202, "remote_host": "127.0.0.1", "remote_port": 54714 }], "version": "iperf 3.19+", "system_info": "Linux windows-nexus 6.6.87.2-microsoft-standard-WSL2 #1 SMP PREEMPT_DYNAMIC Thu Jun 5 18:30:46 UTC 2025 x86_64", "sock_bufsize": 0, "sndbuf_actual": 16384, "rcvbuf_actual": 131072, "timestamp": { "time": "Mon, 14 Jul 2025 17:47:32 GMT", "timesecs": 1752515252, "timemillisecs": 1752515252430 }, "accepted_connection": { "host": "127.0.0.1", "port": 54708 }, "cookie": "6qnxxmqahsmytu7tr3spkqhgrk7irlyktagx", "tcp_mss_default": 0, "target_bitrate": 0, "fq_rate": 500000000, "test_start": { "protocol": "TCP", "num_streams": 1, "blksize": 131072, "omit": 1, "duration": 2, "bytes": 0, "blocks": 0, "reverse": 0, "tos": 0, "target_bitrate": 0, "bidir": 0, "fqrate": 500000000, "interval": 1 } }, "intervals": [{ "streams": [{ "socket": 5, "start": 0, "end": 1.001054, "seconds": 1.001054048538208, "bytes": 62914560, "bits_per_second": 502786518.6050337, "omitted": true, "sender": false }], "sum": { "start": 0, "end": 1.001054, "seconds": 1.001054048538208, "bytes": 62914560, "bits_per_second": 502786518.6050337, "omitted": true, "sender": false } }, { "streams": [{ "socket": 5, "start": 1.3e-05, "end": 1.000991, "seconds": 1.0010039806365967, "bytes": 62521344, "bits_per_second": 499669093.90501356, "omitted": false, "sender": false }], "sum": { "start": 1.3e-05, "end": 1.000991, "seconds": 1.0010039806365967, "bytes": 62521344, "bits_per_second": 499669093.90501356, "omitted": false, "sender": false } }, { "streams": [{ "socket": 5, "start": 1.000991, "end": 2.001042, "seconds": 1.0000510215759277, "bytes": 62390272, "bits_per_second": 499096711.29924917, "omitted": false, "sender": false }], "sum": { "start": 1.000991, "end": 2.001042, "seconds": 1.0000510215759277, "bytes": 62390272, "bits_per_second": 499096711.29924917, "omitted": false, "sender": false } }, { "streams": [{ "socket": 5, "start": 2.001042, "end": 2.002375, "seconds": 0.0013330000219866633, "bytes": 131072, "bits_per_second": 786628644.189543, "omitted": false, "sender": false }], "sum": { "start": 2.001042, "end": 2.002375, "seconds": 0.0013330000219866633, "bytes": 131072, "bits_per_second": 786628644.189543, "omitted": false, "sender": false } }], "end": { "streams": [{ "sender": { "socket": 5, "start": 0, "end": 2.002327, "seconds": 2.002327, "bytes": 124649472, "bits_per_second": 498018443.54094, "retransmits": 0, "reorder": 0, "max_snd_cwnd": 0, "max_snd_wnd": 0, "max_rtt": 0, "min_rtt": 0, "mean_rtt": 0, "sender": false }, "receiver": { "socket": 5, "start": 0, "end": 2.002375, "seconds": 2.002375, "bytes": 125042688, "bits_per_second": 499577503.71433926, "sender": false } }], "sum_sent": { "start": 0, "end": 2.002327, "seconds": 2.002327, "bytes": 124649472, "bits_per_second": 498018443.54094, "retransmits": 0, "sender": false }, "sum_received": { "start": 0, "end": 2.002375, "seconds": 2.002375, "bytes": 125042688, "bits_per_second": 499577503.71433926, "sender": false }, "cpu_utilization_percent": { "host_total": 2.0814591122934472, "host_user": 0.16557515140820453, "host_system": 1.9158839608852427, "remote_total": 1.5036114967449765, "remote_user": 0.023864735875288281, "remote_system": 1.4797800450201419 }, "sender_tcp_congestion": "cubic", "receiver_tcp_congestion": "cubic" } }Client JSON
{ "start": { "connected": [{ "socket": 5, "local_host": "127.0.0.1", "local_port": 54714, "remote_host": "127.0.0.1", "remote_port": 5202 }], "version": "iperf 3.19+", "system_info": "Linux windows-nexus 6.6.87.2-microsoft-standard-WSL2 #1 SMP PREEMPT_DYNAMIC Thu Jun 5 18:30:46 UTC 2025 x86_64", "timestamp": { "time": "Mon, 14 Jul 2025 17:47:32 GMT", "timesecs": 1752515252, "timemillisecs": 1752515252430 }, "connecting_to": { "host": "127.0.0.1", "port": 5202 }, "cookie": "6qnxxmqahsmytu7tr3spkqhgrk7irlyktagx", "tcp_mss_default": 32768, "target_bitrate": 0, "fq_rate": 500000000, "sock_bufsize": 0, "sndbuf_actual": 16384, "rcvbuf_actual": 131072, "test_start": { "protocol": "TCP", "num_streams": 1, "blksize": 131072, "omit": 1, "duration": 2, "bytes": 0, "blocks": 0, "reverse": 0, "tos": 0, "target_bitrate": 0, "bidir": 0, "fqrate": 500000000, "interval": 1 } }, "intervals": [{ "streams": [{ "socket": 5, "start": 0, "end": 1.000937, "seconds": 1.0009369850158691, "bytes": 65404928, "bits_per_second": 522749615.44327831, "retransmits": 0, "snd_cwnd": 654830, "snd_wnd": 6127872, "rtt": 1083, "rttvar": 9, "pmtu": 65535, "reorder": 0, "omitted": true, "sender": true }], "sum": { "start": 0, "end": 1.000937, "seconds": 1.0009369850158691, "bytes": 65404928, "bits_per_second": 522749615.44327831, "retransmits": 0, "omitted": true, "sender": true } }, { "streams": [{ "socket": 5, "start": 8.6e-05, "end": 1.00049, "seconds": 1.0005760192871094, "bytes": 62259200, "bits_per_second": 497786865.16479534, "retransmits": 0, "snd_cwnd": 654830, "snd_wnd": 6127872, "rtt": 1083, "rttvar": 7, "pmtu": 65535, "reorder": 0, "omitted": false, "sender": true }], "sum": { "start": 8.6e-05, "end": 1.00049, "seconds": 1.0005760192871094, "bytes": 62259200, "bits_per_second": 497786865.16479534, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 1.00049, "end": 2.002327, "seconds": 1.0018370151519775, "bytes": 62390272, "bits_per_second": 498206962.26150489, "retransmits": 0, "snd_cwnd": 654830, "snd_wnd": 6127872, "rtt": 1091, "rttvar": 20, "pmtu": 65535, "reorder": 0, "omitted": false, "sender": true }], "sum": { "start": 1.00049, "end": 2.002327, "seconds": 1.0018370151519775, "bytes": 62390272, "bits_per_second": 498206962.26150489, "retransmits": 0, "omitted": false, "sender": true } }], "end": { "streams": [{ "sender": { "socket": 5, "start": 0, "end": 2.002327, "seconds": 2.002327, "bytes": 124649472, "bits_per_second": 498018443.54094, "retransmits": 0, "reorder": 0, "max_snd_cwnd": 654830, "max_snd_wnd": 6127872, "max_rtt": 1091, "min_rtt": 1083, "mean_rtt": 1085, "sender": true }, "receiver": { "socket": 5, "start": 0, "end": 2.002375, "seconds": 2.002327, "bytes": 125042688, "bits_per_second": 499577503.71433926, "sender": true } }], "sum_sent": { "start": 0, "end": 2.002327, "seconds": 2.002327, "bytes": 124649472, "bits_per_second": 498018443.54094, "retransmits": 0, "sender": true }, "sum_received": { "start": 0, "end": 2.002375, "seconds": 2.002375, "bytes": 125042688, "bits_per_second": 499577503.71433926, "sender": true }, "cpu_utilization_percent": { "host_total": 1.5036114967449765, "host_user": 0.023864735875288281, "host_system": 1.4797800450201419, "remote_total": 2.0814591122934472, "remote_user": 0.16557515140820453, "remote_system": 1.9158839608852427 }, "sender_tcp_congestion": "cubic", "receiver_tcp_congestion": "cubic" } }Update 07-14-2025
My first round of changes were breaking. Moving the call to the reporter callback function would break
--get-server-outputby leaving theendsection empty. The root of this issue is that the server calls the callback BEFORE receiving results from the client as part ofiperf_exchange_results. The expected behavior for the server is as follows:EXCHANGE_RESULTS.The latest changes reflect this flow, and a change to the report callback was made to also trigger for the
EXCHANGE_RESULTStest state. I have not thoroughly tested how that change impacts other areas of the code, so I would definitely appreciate any thoughts for concern there from the maintainers.Server JSON
{ "start": { "connected": [{ "socket": 5, "local_host": "127.0.0.1", "local_port": 5202, "remote_host": "127.0.0.1", "remote_port": 51526 }, { "socket": 9, "local_host": "127.0.0.1", "local_port": 5202, "remote_host": "127.0.0.1", "remote_port": 51536 }], "version": "iperf 3.19+", "system_info": "Linux windows-nexus 6.6.87.2-microsoft-standard-WSL2 #1 SMP PREEMPT_DYNAMIC Thu Jun 5 18:30:46 UTC 2025 x86_64", "sock_bufsize": 0, "sndbuf_actual": 16384, "rcvbuf_actual": 131072, "timestamp": { "time": "Mon, 14 Jul 2025 20:34:46 GMT", "timesecs": 1752525286, "timemillisecs": 1752525286818 }, "accepted_connection": { "host": "127.0.0.1", "port": 51516 }, "cookie": "abwqn6l3lf5qjnjygqipc43uzk2jt7q5wdpu", "tcp_mss_default": 0, "target_bitrate": 0, "fq_rate": 500000000, "test_start": { "protocol": "TCP", "num_streams": 2, "blksize": 131072, "omit": 1, "duration": 2, "bytes": 0, "blocks": 0, "reverse": 0, "tos": 0, "target_bitrate": 0, "bidir": 0, "fqrate": 500000000, "interval": 1 } }, "intervals": [{ "streams": [{ "socket": 5, "start": 0, "end": 1.000216, "seconds": 1.000216007232666, "bytes": 62783488, "bits_per_second": 502159433.93031961, "omitted": true, "sender": false }, { "socket": 9, "start": 0, "end": 1.000226, "seconds": 1.0002260208129883, "bytes": 62783488, "bits_per_second": 502154406.65276271, "omitted": true, "sender": false }], "sum": { "start": 0, "end": 1.000216, "seconds": 1.000216007232666, "bytes": 125566976, "bits_per_second": 1004318867.8606392, "omitted": true, "sender": false } }, { "streams": [{ "socket": 5, "start": 5.1e-05, "end": 1.00097, "seconds": 1.0010210275650024, "bytes": 62521344, "bits_per_second": 499660584.76980478, "omitted": false, "sender": false }, { "socket": 9, "start": 4.1e-05, "end": 1.000977, "seconds": 1.0010180473327637, "bytes": 62521344, "bits_per_second": 499662072.35995078, "omitted": false, "sender": false }], "sum": { "start": 5.1e-05, "end": 1.00097, "seconds": 1.0010210275650024, "bytes": 125042688, "bits_per_second": 999321169.53960955, "omitted": false, "sender": false } }, { "streams": [{ "socket": 5, "start": 1.00097, "end": 2.000962, "seconds": 0.9999920129776, "bytes": 62521344, "bits_per_second": 500174746.90690744, "omitted": false, "sender": false }, { "socket": 9, "start": 1.000977, "end": 2.000968, "seconds": 0.999990999698639, "bytes": 62521344, "bits_per_second": 500175253.728017, "omitted": false, "sender": false }], "sum": { "start": 1.00097, "end": 2.000962, "seconds": 0.9999920129776, "bytes": 125042688, "bits_per_second": 1000349493.8138149, "omitted": false, "sender": false } }, { "streams": [{ "socket": 5, "start": 2.000962, "end": 2.00393, "seconds": 0.0029680000152438879, "bytes": 131072, "bits_per_second": 353293798.724538, "omitted": false, "sender": false }, { "socket": 9, "start": 2.000968, "end": 2.003932, "seconds": 0.0029639999847859144, "bytes": 131072, "bits_per_second": 353770582.1127854, "omitted": false, "sender": false }], "sum": { "start": 2.000962, "end": 2.00393, "seconds": 0.0029680000152438879, "bytes": 262144, "bits_per_second": 706587597.449076, "omitted": false, "sender": false } }], "end": { "streams": [{ "sender": { "socket": 5, "start": 0, "end": 2.003197, "seconds": 2.003197, "bytes": 124649472, "bits_per_second": 497802151.261209, "retransmits": 0, "reorder": 0, "max_snd_cwnd": 0, "max_snd_wnd": 0, "max_rtt": 0, "min_rtt": 0, "mean_rtt": 0, "sender": false }, "receiver": { "socket": 5, "start": 0, "end": 2.00393, "seconds": 2.00393, "bytes": 125173760, "bits_per_second": 499713103.751129, "sender": false } }, { "sender": { "socket": 9, "start": 0, "end": 2.003197, "seconds": 2.003197, "bytes": 124649472, "bits_per_second": 497802151.261209, "retransmits": 0, "reorder": 0, "max_snd_cwnd": 0, "max_snd_wnd": 0, "max_rtt": 0, "min_rtt": 0, "mean_rtt": 0, "sender": false }, "receiver": { "socket": 9, "start": 0, "end": 2.00393, "seconds": 2.00393, "bytes": 125173760, "bits_per_second": 499713103.751129, "sender": false } }], "sum_sent": { "start": 0, "end": 2.003197, "seconds": 2.003197, "bytes": 249298944, "bits_per_second": 995604302.522418, "retransmits": 0, "sender": false }, "sum_received": { "start": 0, "end": 2.00393, "seconds": 2.00393, "bytes": 250347520, "bits_per_second": 999426207.502258, "sender": false }, "cpu_utilization_percent": { "host_total": 4.3199350250562958, "host_user": 0.279305713434535, "host_system": 4.04059602527765, "remote_total": 3.0420990823002212, "remote_user": 1.4897442849610014, "remote_system": 1.5523547973392195 }, "sender_tcp_congestion": "cubic", "receiver_tcp_congestion": "cubic" } }Client JSON
{ "start": { "connected": [{ "socket": 5, "local_host": "127.0.0.1", "local_port": 51526, "remote_host": "127.0.0.1", "remote_port": 5202 }, { "socket": 8, "local_host": "127.0.0.1", "local_port": 51536, "remote_host": "127.0.0.1", "remote_port": 5202 }], "version": "iperf 3.19+", "system_info": "Linux windows-nexus 6.6.87.2-microsoft-standard-WSL2 #1 SMP PREEMPT_DYNAMIC Thu Jun 5 18:30:46 UTC 2025 x86_64", "timestamp": { "time": "Mon, 14 Jul 2025 20:34:46 GMT", "timesecs": 1752525286, "timemillisecs": 1752525286818 }, "connecting_to": { "host": "127.0.0.1", "port": 5202 }, "cookie": "abwqn6l3lf5qjnjygqipc43uzk2jt7q5wdpu", "tcp_mss_default": 32768, "target_bitrate": 0, "fq_rate": 500000000, "sock_bufsize": 0, "sndbuf_actual": 16384, "rcvbuf_actual": 131072, "test_start": { "protocol": "TCP", "num_streams": 2, "blksize": 131072, "omit": 1, "duration": 2, "bytes": 0, "blocks": 0, "reverse": 0, "tos": 0, "target_bitrate": 0, "bidir": 0, "fqrate": 500000000, "interval": 1 } }, "intervals": [{ "streams": [{ "socket": 5, "start": 0, "end": 1.000852, "seconds": 1.0008519887924194, "bytes": 65404928, "bits_per_second": 522794009.36327845, "retransmits": 0, "snd_cwnd": 654830, "snd_wnd": 3858944, "rtt": 1078, "rttvar": 10, "pmtu": 65535, "reorder": 0, "omitted": true, "sender": true }, { "socket": 8, "start": 0, "end": 1.000856, "seconds": 1.0008560419082642, "bytes": 65404928, "bits_per_second": 522791892.23094958, "retransmits": 0, "snd_cwnd": 654830, "snd_wnd": 6127872, "rtt": 1084, "rttvar": 6, "pmtu": 65535, "reorder": 0, "omitted": true, "sender": true }], "sum": { "start": 0, "end": 1.000852, "seconds": 1.0008519887924194, "bytes": 130809856, "bits_per_second": 1045588018.7265569, "retransmits": 0, "omitted": true, "sender": true } }, { "streams": [{ "socket": 5, "start": 5.2e-05, "end": 1.000946, "seconds": 1.0009980201721191, "bytes": 62259200, "bits_per_second": 497577008.10872483, "retransmits": 0, "snd_cwnd": 654830, "snd_wnd": 3858944, "rtt": 1062, "rttvar": 17, "pmtu": 65535, "reorder": 0, "omitted": false, "sender": true }, { "socket": 8, "start": 4.8e-05, "end": 1.000952, "seconds": 1.0010000467300415, "bytes": 62259200, "bits_per_second": 497576000.74750531, "retransmits": 0, "snd_cwnd": 654830, "snd_wnd": 6127872, "rtt": 1081, "rttvar": 14, "pmtu": 65535, "reorder": 0, "omitted": false, "sender": true }], "sum": { "start": 5.2e-05, "end": 1.000946, "seconds": 1.0009980201721191, "bytes": 124518400, "bits_per_second": 995154016.21744967, "retransmits": 0, "omitted": false, "sender": true } }, { "streams": [{ "socket": 5, "start": 1.000946, "end": 2.003197, "seconds": 1.0022510290145874, "bytes": 62390272, "bits_per_second": 498001160.93743163, "retransmits": 0, "snd_cwnd": 654830, "snd_wnd": 3858944, "rtt": 1084, "rttvar": 14, "pmtu": 65535, "reorder": 0, "omitted": false, "sender": true }, { "socket": 8, "start": 1.000952, "end": 2.0032, "seconds": 1.0022480487823486, "bytes": 62390272, "bits_per_second": 498002641.767568, "retransmits": 0, "snd_cwnd": 654830, "snd_wnd": 6127872, "rtt": 1081, "rttvar": 5, "pmtu": 65535, "reorder": 0, "omitted": false, "sender": true }], "sum": { "start": 1.000946, "end": 2.003197, "seconds": 1.0022510290145874, "bytes": 124780544, "bits_per_second": 996002321.87486327, "retransmits": 0, "omitted": false, "sender": true } }], "end": { "streams": [{ "sender": { "socket": 5, "start": 0, "end": 2.003197, "seconds": 2.003197, "bytes": 124649472, "bits_per_second": 497802151.261209, "retransmits": 0, "reorder": 0, "max_snd_cwnd": 654830, "max_snd_wnd": 3858944, "max_rtt": 1084, "min_rtt": 1062, "mean_rtt": 1074, "sender": true }, "receiver": { "socket": 5, "start": 0, "end": 2.00393, "seconds": 2.003197, "bytes": 125173760, "bits_per_second": 499713103.751129, "sender": true } }, { "sender": { "socket": 8, "start": 0, "end": 2.003197, "seconds": 2.003197, "bytes": 124649472, "bits_per_second": 497802151.261209, "retransmits": 0, "reorder": 0, "max_snd_cwnd": 654830, "max_snd_wnd": 6127872, "max_rtt": 1084, "min_rtt": 1081, "mean_rtt": 1082, "sender": true }, "receiver": { "socket": 8, "start": 0, "end": 2.00393, "seconds": 2.003197, "bytes": 125173760, "bits_per_second": 499713103.751129, "sender": true } }], "sum_sent": { "start": 0, "end": 2.003197, "seconds": 2.003197, "bytes": 249298944, "bits_per_second": 995604302.522418, "retransmits": 0, "sender": true }, "sum_received": { "start": 0, "end": 2.00393, "seconds": 2.00393, "bytes": 250347520, "bits_per_second": 999426207.502258, "sender": true }, "cpu_utilization_percent": { "host_total": 3.0420990823002212, "host_user": 1.4897442849610014, "host_system": 1.5523547973392195, "remote_total": 4.3199350250562958, "remote_user": 0.279305713434535, "remote_system": 4.04059602527765 }, "sender_tcp_congestion": "cubic", "receiver_tcp_congestion": "cubic" }, "server_output_json": { "start": { "connected": [{ "socket": 5, "local_host": "127.0.0.1", "local_port": 5202, "remote_host": "127.0.0.1", "remote_port": 51526 }, { "socket": 9, "local_host": "127.0.0.1", "local_port": 5202, "remote_host": "127.0.0.1", "remote_port": 51536 }], "version": "iperf 3.19+", "system_info": "Linux windows-nexus 6.6.87.2-microsoft-standard-WSL2 #1 SMP PREEMPT_DYNAMIC Thu Jun 5 18:30:46 UTC 2025 x86_64", "sock_bufsize": 0, "sndbuf_actual": 16384, "rcvbuf_actual": 131072, "timestamp": { "time": "Mon, 14 Jul 2025 20:34:46 GMT", "timesecs": 1752525286, "timemillisecs": 1752525286818 }, "accepted_connection": { "host": "127.0.0.1", "port": 51516 }, "cookie": "abwqn6l3lf5qjnjygqipc43uzk2jt7q5wdpu", "tcp_mss_default": 0, "target_bitrate": 0, "fq_rate": 500000000, "test_start": { "protocol": "TCP", "num_streams": 2, "blksize": 131072, "omit": 1, "duration": 2, "bytes": 0, "blocks": 0, "reverse": 0, "tos": 0, "target_bitrate": 0, "bidir": 0, "fqrate": 500000000, "interval": 1 } }, "intervals": [{ "streams": [{ "socket": 5, "start": 0, "end": 1.000216, "seconds": 1.000216007232666, "bytes": 62783488, "bits_per_second": 502159433.93031961, "omitted": true, "sender": false }, { "socket": 9, "start": 0, "end": 1.000226, "seconds": 1.0002260208129883, "bytes": 62783488, "bits_per_second": 502154406.65276271, "omitted": true, "sender": false }], "sum": { "start": 0, "end": 1.000216, "seconds": 1.000216007232666, "bytes": 125566976, "bits_per_second": 1004318867.8606392, "omitted": true, "sender": false } }, { "streams": [{ "socket": 5, "start": 5.1e-05, "end": 1.00097, "seconds": 1.0010210275650024, "bytes": 62521344, "bits_per_second": 499660584.76980478, "omitted": false, "sender": false }, { "socket": 9, "start": 4.1e-05, "end": 1.000977, "seconds": 1.0010180473327637, "bytes": 62521344, "bits_per_second": 499662072.35995078, "omitted": false, "sender": false }], "sum": { "start": 5.1e-05, "end": 1.00097, "seconds": 1.0010210275650024, "bytes": 125042688, "bits_per_second": 999321169.53960955, "omitted": false, "sender": false } }, { "streams": [{ "socket": 5, "start": 1.00097, "end": 2.000962, 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